The ecosystem on our planet is constantly changing because some species become ______ every day while new species are being discovered.
A: are wiped out
B: get prosperousB.
C: become overpopulated
D: remain instinctive
A: are wiped out
B: get prosperousB.
C: become overpopulated
D: remain instinctive
举一反三
- This species has nearly died out because its habitat is being destroyed. A: turned dead B: passed by C: carried away D: become extinct
- Questions 22 to 25 are based on the following passage. What has happened since the end of the Ice Age A: Many species have moved further north. B: Many new species have come into existence. C: Many species have developed a habit of migration. D: Many species have become less sensitive to climate.
- There is every possibility that many species (物种) of animals will die out because of their disappearing food ________. A: mode B: source C: pattern D: foundation
- This species has nearly________ because its habitat is being destroyed.. A: died of B: died out C: died away D: died from
- Invasive species are defined as A: a species not native to an area that spreads and causes damage to the area B: species suited to stable environments that produce a few, relatively large offspring and provide parental care C: species suited to changing environments that produce many offspring and provide little or no parental care D: species whose presence is key to maintaining biodiversity in an ecosystem and to upholding an ecological community’s structure